XYZ Co. Purchased a delivery van on January 1, 2016 for $100,000. At the time of purchased it was estimated that the van would be used for 7 years with a $51,000 trade-in value. On January 1, 2020 the company decided to revise the useful life to 10 years and revise the residual value to $10,000. Using straight-line depreciation, determine the book value on January 1, 2020 and the revised depreciation for 2020